AU6439 - USB2.0 Single-LUN SD/MMC/MS Flash Card Reader Controller

The AU6439 is designed to deliver outstanding performance for data transmission between USB and compatible flash card interface. It supports USB 2.0 high-speed transferring to various types of flash media cards such as SD, MMC and MS. Besides, the AU6439 supports several operating systems, including MS Windows, LINUX and Mac OS.

The design of 2-in-1 combo single slot makes the AU6439 more attractive and optimal. The AU6439 integrates a high performance 8051 CPU as well as a splendidly efficient DMA hardware engine and internal 3.3V to 1.8V regulators. The AU6439 provides manufacturers not merely BOM cost saving with the minimal numbers of components needed on the PCB but also smaller circuit board with the 28-pin SSOP package.

In addition to high-speed 8051 CPU embedded and DMA hardware engine integrated, the AU6439 is fully compliant with USB Device Class Definition for Mass Storage and Bulk-Transport V1.0.Combination with these features, the AU6439 provides a completely ultra high performance USB2.0 card reader solution in a single chip.

AU6439 maximizes performance with the latest and fastest flash card specification available from the industry. Based on the features of low pin count and high performance characteristic, AU6439 supports a wide range of flash card reader applications used to digital camera, MP3 players, cell phone, PDA, camcorder, GPS device and so on to store many types of data, such as digital map, digital photos and compressed music.

Main Features:

General

• Fully compatible with USB 2.0 High Speed and backward compatible with USB 1.1 specifications.
• Supports multiple flash card interfaces, including SD, SDHC, MMC, MS, MS PRO, and MS PRO-HG.
• Supports single LUN.
• Supports operation systems:
  • Support default Mass Storage Class driver form Windows ME, 2000, XP, Vista, Windows 7 and Mac OS.
  • Windows 98 is supported by vendor driver from Alcor
• Available in 28-pin SSOP lead-free, Halogen-free, RoHS compliant package.

• Complies with USB Device Class Definition for Mass Storage and Bulk-Transport V1.0
• Complies with Secure Digital Card (SD) specification up to V2.0 (SDHC)
• Complies with MultiMedia Card (MMC) specification up to V4.2
• Complies with Memory Stick (MS) specification up to V1.43
• Complies with Memory Stick PRO (MS_Pro) specification up to V1.02
• Complies with Memory Stick PRO-HG (MS PRO-HG) specification up to V1.01
• Complies with Memory Stick Interface Guideline for PC peripheral devices with Memory Stick Slot V1.16-00

• 1K bytes of ping-pong FIFO buffs the data transmission between transmitter and receiver
• Integrated hardware DMA engine enhances overall performance of data transfers
• Supports power saving mode to reduce power consumption.
• User-friendly Dynamic Icon Utility software can display icon message upon insertion/removal of compatible flash cards under Windows.
• Optimizes performance via multiple sectors transfer.
• On chip 5V to 3.3V and 3.3V to 1.8V regulator offers customers lower BOM cost.
• Clock runs at 48MHz crystal.

Application Diagram: